Malicious PDF — malware analysis report

Static analysis result for SHA-256 026ae4a2248929c6…

MALICIOUS

PDF

80.3 KB Created: 2021-05-04 05:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1f0d6f68ff4e03c8cbf62bba01bd297 SHA-1: e34876d2efb8ff08e3b9af2c864ea230a5d8920b SHA-256: 026ae4a2248929c608d7382779a91c8cd64c2a4e49720354b8f2e3ed59519d30
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous external links, many of which are part of a link farm, suggesting a phishing or SEO manipulation attempt. The embedded URL and the document's content, which mentions recovering a Facebook password, strongly indicate a phishing lure. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/strik?utm_term=recover+facebook+password+without+email+and+phone+number+2020
    • https://zesudegefomoga.weebly.com/uploads/1/3/1/0/131070027/napawoparaxile_kobamom.pdf
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/a875a1812ddba.pdf
    • https://fafiwopadatomag.weebly.com/uploads/1/3/5/3/135326984/femugagifi_xazex_gojakoluli.pdf
    • https://wufowidujexo.weebly.com/uploads/1/3/5/2/135293423/1914598.pdf
    • https://cdn-cms.f-static.net/uploads/4457868/normal_600dcd6fec6a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_3be45d3524b24d31ad7312cda8dd4b84.pdf?index=true
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_784f124be48c4e31afa60a9e2fdbb17a.pdf?index=true
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_9cff39a9d0b24309986969bbe11e2c19.pdf?index=true
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_015871506a23442f81f737be664ad3a6.pdf?index=true
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_6e417413ac084c53be2586fcb4301da0.pdf?index=true
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_00cf7ea44e2f4f8a90891d5a0bb1a5f6.pdf?index=true
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_a293b2488ee041a6a934a195aff0c50a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d69c53fb-3b2d-40aa-9df2-8354696129c8/what_are_the_types_of_gears.pdf
    • https://uploads.strikinglycdn.com/files/f4d07fc3-de41-4dc8-b2ae-dcac3f63d6b8/31717847340.pdf
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_a632f33521cb4c769f4f9ceca3bc79b5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fb.bin
17975863e541a46192925b5188f00f27c397812edd12ce3139b39353f832a3fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 6032 bytes
font_01_sfnt_off00010d71.bin
d3a95ce5e0b688d99ac9954cb76d4452d4a70b64a81e80b2345bbc41c76807f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 11160 bytes

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